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Add msgpack parser node to pack/unpack msgpack compressed buffers.

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Dave C-J 2014-09-17 21:02:23 +01:00
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<!--
Copyright 2014 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="msgpack">
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips">Only supports object to/from msgpack buffer.</div>
</script>
<script type="text/x-red" data-help-name="msgpack">
<p>A function that converts the <b>msg.payload</b> to and from <a href = "https://github.com/msgpack/msgpack-node"><i>msgpack</i></a> format.</p>
<p>If the input is an object it converts it to a msgpack buffer.</p>
<p>If the input is a msgpack buffer it converts it back to an object.</p>
<p>Current only supports object type.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('msgpack',{
category: 'function',
color:"#DEBD5C",
defaults: {
name: {value:""}
},
inputs:1,
outputs:1,
icon: "arrow-in.png",
label: function() {
return this.name||"msgpack";
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>

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parsers/msgpack/70-msgpack.js Normal file
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/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
var msgpack = require('msgpack');
function MsgPackNode(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input", function(msg) {
if (Buffer.isBuffer(msg.payload)) {
var l = msg.payload.length;
msg.payload = msgpack.unpack(msg.payload);
if (typeof msg.payload === "object") {
node.send(msg);
node.status({text:l +" b->o "+ JSON.stringify(msg.payload).length});
}
else {
node.warn("Input not a MsgPack buffer");
node.status({text:"not a msgpack buffer"});
}
}
else if (typeof msg.payload === "object") {
var l = JSON.stringify(msg.payload).length;
msg.payload = msgpack.pack(msg.payload);
node.send(msg);
node.status({text:l +" o->b "+ msg.payload.length});
}
else {
node.warn("This node only handles js objects or msgpack buffers.");
node.status({text:"error"});
}
});
}
RED.nodes.registerType("msgpack",MsgPackNode);
}

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node-red-node-msgpack
=====================
A <a href="http://nodered.org" target="_new">Node-RED</a> node to pack and unpack objects to msgpack format buffers.
Install
-------
Run the following command in the root directory of your Node-RED install
npm install node-red-node-msgpack
Usage
-----
Uses the <a href="https://www.npmjs.org/package/msgpack">msgpack npm</a> to pack and unpack msg.payload objects to <a href="http://msgpack.org/">msgpack</a> format buffers.
If the input is an object it converts it to a msgpack buffer.
If the input is a msgpack buffer it converts it back to an object.
Current only supports msg.payloads of type object.

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{
"name" : "node-red-node-msgpack",
"version" : "0.0.1",
"description" : "A Node-RED node to pack and unpack objects to msgpack format",
"dependencies" : {
"msgpack" : "0.2.4"
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/parsers/msgpack"
},
"license": "Apache-2.0",
"keywords": [ "node-red", "msgpack" ],
"node-red" : {
"nodes" : {
"msgpack": "70-msgpack.js"
}
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}